Activity rule

The activity rule of earth pressure in the stope is concluded through a systematic analysis on the data, providing a theoretic basis for mining of such orebody.通过对资料的系统分析得出采场地压活动规律，为这类矿体的开采提供了必要的理论依据。

The purpose of environmental management is to create a new productive method, consumptive way, social activity rule and development mode, through broadcasting the thought of sustainable development.环境管理的目的是通过对可持续发展思想的传播,创建一种新的生产方式、新的消费方式、新的社会行为规则和新的发展方式。

Active rule of cork cambium is different in different trees, so form the many types of bark.由于木栓形成层活动的规律不同,所以出现有各种各样的树皮。